Talk:ISO 6346

Check digit: special treatment for HCLU?
On 2016-02-25, an anonymous user added (not terribly useful) chinese comments to the Javascript code sample -- and the condition if (con.substr(0, 4) == "HLCU") { sum -= 2; }. This does not match the description of the algorithm above and no equivalent is present in any other code sample. However, I sampled a few container numbers starting with HLCU that I could read on respective containers found via google image search, and indeed the check digit differed by 2 from the expected one calculated by the usual algorithm (e.g. on HLBU... or HLXU... containers; all thse prefixes are for containers operated by Hapag Lloyd), so it seems the HLCU-adjustment is applied in reality.

Does anyone know any documentation on the apparent discrepancy? --217.95.168.92 (talk) 11:13, 6 February 2018 (UTC)

What's the conversion for?
The biggest part of this article is about the conversion algorithm, but it's never introduced. It doesn't appear to be part of the actual number, as depicted here. (The only numerical number with more than 2 digits is the serial number, but that's up to the owner, and unlikely to be connected to any letters.) Is that whole text misplaced? &mdash; Sebastian 23:08, 18 March 2016 (UTC)
 * It seems to be for converting a letter/number coded container to a solely number coded container. Super weird article huh? I can't help but think this informtion is somehow useful though.HappyValleyEditor (talk) 23:13, 18 March 2016 (UTC)
 * I found it in one of the sources: This whole section is just for computing the check digit. Since Wikipedia is not a manual, and since this one small aspect completely overwhelms the rest of the article, I think it's better to remove it. However, some people obviously put some work into the code samples; it may be worth saving somewhere. I'll ask at Wikibooks if that's something they can use there. &mdash; Sebastian 17:10, 21 March 2016 (UTC)
 * I introduced a shortened version of the Excel formula. Hope it helps someone out there. Greasyham (talk) 18:38, 15 September 2016 (UTC)

Reefer subgroups
The groups and subgroups for reefers are confusing. This article lists:

The Swedish version lists:

and type codes R4-R9 as spares. The type code table in this article agrees:

So, questions:


 * Are R7 and R9 actually valid size codes? If so, which group(s) do they belong to?
 * Which groups do R0, R1, R2 and R3 belong to?
 * Are RC and RE both valid group codes? If not, either this or the Swedish article should be corrected.

Waitak (talk) 15:58, 29 March 2016 (UTC)

Size / type codes?
Their meaning is mentioned in the article, but nowhere is explained where one would find them on the container. Are they part of the serial number…? --Rohieb (talk) 21:20, 29 September 2022 (UTC)